These sounds are likely chosen at random from a predefined list of sounds along a given musical scale; possibly the background drones also have a say in the mat

These sounds are likely chosen at random from a predefined list of sounds along a given musical scale; possibly the background drones also have a say in the matter. You can read the source at https://github.audio/static/public/js/main.js https://github.audio/static/public/js/main.js and possibly infer some information from it/